<template>
    <div class="detail">
      <Header/>
      <div class="main">
        <div class="course-info">
          <div class="wrap-left">
            <!-- 课程封面或封面商品 -->
            <AliPlayerV3
              ref="player"
              class="h-64 md:h-96 w-full rounded-lg"
              style="height: 100%; width: 100%;"
              :source="course.info.course_video"
              :cover="course.info.course_cover"
              :options="options"
              @play="onPlay($event)"
              @pause="onPause($event)"
              @playing="onPlaying($event)"
              v-if="course.info.course_video"
            />
            <img :src="course.info.course_cover" style="width: 100%;" alt="" v-else>
          </div>
          <div class="wrap-right">
            <h3 class="course-name">{{course.info.name}}</h3>
            <p class="data">{{course.info.students}}人在学&nbsp;&nbsp;&nbsp;&nbsp;课程总时长：{{course.info.pub_lessons}}课时/{{course.info.lessons}}课时&nbsp;&nbsp;&nbsp;&nbsp;难度：{{course.info.get_level_display}}</p>
            <div class="sale-time" v-if="course.info.discount.type">
              <p class="sale-type">{{course.info.discount.type}}</p>
              <p class="expire" v-if="course.info.discount.expire>0">距离结束：仅剩 {{parseInt(course.info.discount.expire/86400)}}天 {{fill0(parseInt(course.info.discount.expire/3600%24))}}小时 {{fill0(parseInt(course.info.discount.expire/60%60))}}分 <span class="second">{{fill0(parseInt(course.info.discount.expire%60))}}</span> 秒</p>
            </div>
            <div class="sale-time" v-if="!course.info.discount.type">
              <p class="sale-type">课程价格 ¥{{parseFloat(course.info.price).toFixed(2)}}</p>
            </div>
            <p class="course-price" v-if="course.info.discount.price >= 0">
              <span>活动价</span>
              <span class="discount">¥{{parseFloat(course.info.discount.price).toFixed(2)}}</span>
              <span class="original">¥{{parseFloat(course.info.price).toFixed(2)}}</span>
            </p>
            <p class="course-price" v-if="course.info.credit>0">
              <span>抵扣积分</span>
              <span class="discount">{{course.info.credit}}</span>
            </p>
            <div class="buy">
              <div class="buy-btn">
                <button class="buy-now">立即购买</button>
                <button class="free">免费试学</button>
              </div>
              <el-popconfirm title="您确认添加当前课程加入购物车吗？" @confirm="add_cart" confirmButtonText="买买买！" cancelButtonText="误操作！">
                <template #reference>
                  <div class="add-cart"><img src="../assets/cart-yellow.svg" alt="">加入购物车</div>
                </template>
              </el-popconfirm>
              <!--              <div class="add-cart"><img src="../assets/cart-yellow.svg" alt="">加入购物车</div>-->
            </div>
          </div>
        </div>
        <div class="course-tab">
          <ul class="tab-list">
            <li :class="course.tabIndex===1?'active':''" @click="course.tabIndex=1">详情介绍</li>
            <li :class="course.tabIndex===2?'active':''" @click="course.tabIndex=2">课程章节 <span :class="state.tabIndex!==2?'free':''" v-if="course.con_free_study">(试学)</span></li>
            <li :class="course.tabIndex===3?'active':''" @click="course.tabIndex=3">用户评论 (42)</li>
            <li :class="course.tabIndex===4?'active':''" @click="course.tabIndex=4">常见问题</li>
          </ul>
        </div>
        <div class="course-content">
          <div class="course-tab-list">
            <div class="tab-item" v-if="course.tabIndex===1" v-html="course.info.description"></div>
            <div class="tab-item" v-if="course.tabIndex===2">
              <div class="tab-item-title">
                <p class="chapter">课程章节</p>
                <p class="chapter-length">共{{course.chapter_list.length}}章 {{course.info.lessons}}个课时</p>
              </div>
              <div class="chapter-item" v-for="chapter in course.chapter_list">
                <p class="chapter-title"><img src="../assets/1.svg" alt="">第{{chapter.orders}}章·{{chapter.name}}</p>
                <div class="chapter-title" style="padding-left: 2.4rem;" v-if="chapter.summary" v-html="chapter.summary"></div>
                <ul class="lesson-list">
                  <li class="lesson-item" v-for="lesson in chapter.get_lesson_list">
                    <p class="name">
                      <span class="index">{{chapter.orders}}-{{lesson.orders}}</span>
                      {{lesson.name}}
                      <span class="free" v-if="lesson.free_trail">免费</span>
                    </p>
                    <p class="time">{{lesson.duration}} <img src="../assets/chapter-player.svg"></p>
                    <button class="try"  v-if="lesson.free_trail">立即试学</button>
                    <button class="try" v-else>购买课程</button>
                  </li>
                </ul>
              </div>
            </div>
            <div class="tab-item" v-if="course.tabIndex===3">
              用户评论
            </div>
            <div class="tab-item" v-if="course.tabIndex===4">
              常见问题
            </div>
          </div>
          <div class="course-side">
             <div class="teacher-info">
               <h4 class="side-title"><span>授课老师</span></h4>
               <div class="teacher-content">
                 <div class="cont1">
                   <img :src="course.info.teacher.avatar">
                   <div class="name">
                     <p class="teacher-name">{{course.info.teacher.name}}</p>
                     <p class="teacher-title">{{course.info.teacher.get_role_display}}，{{course.info.teacher.title}}</p>
                   </div>
                 </div>
                 <div class="narrative" v-html="course.info.teacher.brief"></div>
               </div>
             </div>
          </div>
        </div>
      </div>
      <Footer/>
    </div>
</template>

<script setup>
import {reactive,ref, watch} from "vue"
import {useRoute, useRouter} from "vue-router"
import Header from "../components/Header.vue"
import Footer from "../components/Footer.vue"
import { AliPlayerV3 } from "vue-aliplayer-v3"
import course from "../api/course"
import cart from "../api/cart";
import { ElMessage } from 'element-plus'
import {fill0} from "../utils/func";
import {useStore} from "vuex";

const store = useStore()
let route = useRoute()
let router= useRouter()
let player = ref(null)

// 获取url地址栏上的课程ID
course.course_id = route.params.id;


// 简单判断课程ID是否合法
if(course.course_id > 0){
  // 根据课程ID到服务端获取课程详情数据
  course.get_course().then(response=> {
    course.info = response.data;
    clearInterval(course.timer);
    course.timer = setInterval(() => {
      if (course.info.discount.expire && course.info.discount.expire > 0) {
        course.info.discount.expire--
      }
    }, 1000);
  }).catch(error=>{
    ElMessage.error({
      message: "非法的URL地址，无法获取课程信息！",
      duration: 1000,
      onClose(){
        router.go(-1);
      }
    })
  })

  // 获取课程章节信息
  course.get_course_chapters().then(response=>{
    course.chapter_list = response.data
  })

}else{
    ElMessage.error({
      message: "非法的URL地址，无法获取课程信息！",
      duration: 1000,
      onClose(){
        router.go(-1)
      }
    })
}


// 阿里云播放器的选项参数
const options = reactive({
  // source: "/src/assets/1.mp4",
  // cover: "/src/assets/course-1.png",
  autoplay: false,   // 是否自动播放
  preload: true,     // 是否自动预加载
  isLive: false,     // 切换为直播流的时候必填true
  // format: 'm3u8'  // 切换为直播流的时候必填
})

const onPlay = (event)=>{
  console.log("播放视频");
  console.log(player.value.getCurrentTime());  // 当前视频播放时间
}

const onPause = (event)=>{
  console.log("暂停播放");
  console.log(player.value.getCurrentTime());
}

const onPlaying = (event)=>{
  console.log("播放中");
  console.log(player.value.getCurrentTime());
  console.log(player.value.getDuration());  // 获取视频长度
}


// 添加商品到购物车
let add_cart = ()=>{
  let token = sessionStorage.token || localStorage.token
  // 详情页中添加商品到购物车，不用传递参数，直接使用state.course来获取课程信息
  cart.add_course_to_cart(course.course_id, token).then(response=>{
    store.commit("cart_total", response.data.cart_total)
    ElMessage.success(response.data.errmsg)
  }).catch(error=>{
    if(error.response.status === 401){
      store.commit("logout");
      ElMessage.error("您尚未登录或已登录超时，请登录后继续操作！");
    }
    ElMessage.error("添加商品到购物车失败！")
  })
}


</script>

<style scoped>
.main{
  background: #fff;
  padding-top: 30px;
}
.course-info{
  width: 1200px;
  margin: 0 auto;
  overflow: hidden;
}
.wrap-left{
  float: left;
  width: 690px;
  height: 388px;
  background-color: #000;
}
.wrap-right{
  float: left;
  position: relative;
  height: 388px;
}
.course-name{
  font-size: 20px;
  color: #333;
  padding: 10px 23px;
  letter-spacing: .45px;
}
.data{
  padding-left: 23px;
  padding-right: 23px;
  padding-bottom: 16px;
  font-size: 14px;
  color: #9b9b9b;
}
.sale-time{
  width: 464px;
  background: #fa6240;
  font-size: 14px;
  color: #4a4a4a;
  padding: 10px 23px;
  overflow: hidden;
}
.sale-type {
  font-size: 16px;
  color: #fff;
  letter-spacing: .36px;
  float: left;
}
.sale-time .expire{
  font-size: 14px;
  color: #fff;
  float: right;
}
.sale-time .expire .second{
  width: 24px;
  display: inline-block;
  background: #fafafa;
  color: #5e5e5e;
  padding: 6px 0;
  text-align: center;
}
.course-price{
  background: #fff;
  font-size: 14px;
  color: #4a4a4a;
  padding: 5px 23px;
}
.discount{
  font-size: 26px;
  color: #fa6240;
  margin-left: 10px;
  display: inline-block;
  margin-bottom: -5px;
}
.original{
  font-size: 14px;
  color: #9b9b9b;
  margin-left: 10px;
  text-decoration: line-through;
}
.buy{
  width: 464px;
  padding: 0px 23px;
  position: absolute;
  left: 0;
  bottom: 20px;
  overflow: hidden;
}
.buy .buy-btn{
  float: left;
}
.buy .buy-now{
  width: 125px;
  height: 40px;
  border: 0;
  background: #ffc210;
  border-radius: 4px;
  color: #fff;
  cursor: pointer;
  margin-right: 15px;
  outline: none;
}
.buy .free{
  width: 125px;
  height: 40px;
  border-radius: 4px;
  cursor: pointer;
  margin-right: 15px;
  background: #fff;
  color: #ffc210;
  border: 1px solid #ffc210;
}
.add-cart{
  float: right;
  font-size: 14px;
  color: #ffc210;
  text-align: center;
  cursor: pointer;
  margin-top: 10px;
}
.add-cart img{
  width: 20px;
  height: 18px;
  margin-right: 7px;
  vertical-align: middle;
}

.course-tab{
    width: 100%;
    background: #fff;
    margin-bottom: 30px;
    box-shadow: 0 2px 4px 0 #f0f0f0;

}
.course-tab .tab-list{
    width: 1200px;
    margin: auto;
    color: #4a4a4a;
    overflow: hidden;
}
.tab-list li{
    float: left;
    margin-right: 15px;
    padding: 26px 20px 16px;
    font-size: 17px;
    cursor: pointer;
}
.tab-list .active{
    color: #ffc210;
    border-bottom: 2px solid #ffc210;
}
.tab-list .free{
    color: #fb7c55;
}
.course-content{
    width: 1200px;
    margin: 0 auto;
    background: #FAFAFA;
    overflow: hidden;
    padding-bottom: 40px;
}
.course-tab-list{
    width: 880px;
    height: auto;
    padding: 20px;
    background: #fff;
    float: left;
    box-sizing: border-box;
    overflow: hidden;
    position: relative;
    box-shadow: 0 2px 4px 0 #f0f0f0;
}
.tab-item{
    width: 880px;
    background: #fff;
    padding-bottom: 20px;
    box-shadow: 0 2px 4px 0 #f0f0f0;
}
.tab-item-title{
    justify-content: space-between;
    padding: 25px 20px 11px;
    border-radius: 4px;
    margin-bottom: 20px;
    border-bottom: 1px solid #333;
    border-bottom-color: rgba(51,51,51,.05);
    overflow: hidden;
}
.chapter{
    font-size: 17px;
    color: #4a4a4a;
    float: left;
}
.chapter-length{
    float: right;
    font-size: 14px;
    color: #9b9b9b;
    letter-spacing: .19px;
}
.chapter-title{
    font-size: 16px;
    color: #4a4a4a;
    letter-spacing: .26px;
    padding: 12px;
    background: #eee;
    border-radius: 2px;
    display: -ms-flexbox;
    display: flex;
    -ms-flex-align: center;
    align-items: center;
}
.chapter-title img{
    width: 18px;
    height: 18px;
    margin-right: 7px;
    vertical-align: middle;
}
.lesson-list{
    padding:0 20px;
}
.lesson-list .lesson-item{
    padding: 15px 20px 15px 36px;
    cursor: pointer;
    justify-content: space-between;
    position: relative;
    overflow: hidden;
}
.lesson-item .name{
    font-size: 14px;
    color: #666;
    float: left;
}
.lesson-item .index{
    margin-right: 5px;
}
.lesson-item .free{
    font-size: 12px;
    color: #fff;
    letter-spacing: .19px;
    background: #ffc210;
    border-radius: 100px;
    padding: 1px 9px;
    margin-left: 10px;
}
.lesson-item .time{
    font-size: 14px;
    color: #666;
    letter-spacing: .23px;
    opacity: 1;
    transition: all .15s ease-in-out;
    float: right;
}
.lesson-item .time img{
    width: 18px;
    height: 18px;
    margin-left: 15px;
    vertical-align: text-bottom;
}
.lesson-item .try{
    width: 86px;
    height: 28px;
    background: #ffc210;
    border-radius: 4px;
    font-size: 14px;
    color: #fff;
    position: absolute;
    right: 20px;
    top: 10px;
    opacity: 0;
    transition: all .2s ease-in-out;
    cursor: pointer;
    outline: none;
    border: none;
}
.lesson-item:hover{
    background: #fcf7ef;
    box-shadow: 0 0 0 0 #f3f3f3;
}
.lesson-item:hover .name{
    color: #333;
}
.lesson-item:hover .try{
    opacity: 1;
}

.course-side{
    width: 300px;
    height: auto;
    margin-left: 20px;
    float: right;
}
.teacher-info{
    background: #fff;
    margin-bottom: 20px;
    box-shadow: 0 2px 4px 0 #f0f0f0;
}
.side-title{
    font-weight: normal;
    font-size: 17px;
    color: #4a4a4a;
    padding: 18px 14px;
    border-bottom: 1px solid #333;
    border-bottom-color: rgba(51,51,51,.05);
}
.side-title span{
    display: inline-block;
    border-left: 2px solid #ffc210;
    padding-left: 12px;
}

.teacher-content{
    padding: 30px 20px;
    box-sizing: border-box;
}

.teacher-content .cont1{
    margin-bottom: 12px;
    overflow: hidden;
}

.teacher-content .cont1 img{
    width: 54px;
    height: 54px;
    margin-right: 12px;
    float: left;
}
.teacher-content .cont1 .name{
    float: right;
}
.teacher-content .cont1 .teacher-name{
    width: 188px;
    font-size: 16px;
    color: #4a4a4a;
    padding-bottom: 4px;
}
.teacher-content .cont1 .teacher-title{
    width: 188px;
    font-size: 13px;
    color: #9b9b9b;
    white-space: nowrap;
}
.teacher-content .narrative{
    font-size: 14px;
    color: #666;
    line-height: 24px;
}
</style>